uboot-mediatek: fixes build when nmbm enabled

The image_header_t typedef has been removed from
uboot v2023.01 [1], replaced with legacy struct.

[1] https://github.com/u-boot/u-boot/commit/f3543e69442ca393e52df253d9c5d45bc189d471

Fixes: 3d5c542 ("uboot-mediatek: update to U-Boot 2023.01")
Signed-off-by: Chukun Pan <[email protected]>

package/boot/uboot-mediatek/patches/100-09-cmd-add-nmbm-command.patch

@@ -205,9 +205,9 @@ Signed-off-by: Weijie Gao <[email protected]>
 +#endif
 +	}
 +
-+	ret = mtd_read(mtd, off, sizeof(image_header_t), &retlen,
++	ret = mtd_read(mtd, off, sizeof(struct legacy_img_hdr), &retlen,
 +		       (void *)loadaddr);
-+	if (ret || retlen != sizeof(image_header_t)) {
++	if (ret || retlen != sizeof(struct legacy_img_hdr)) {
 +		printf("Failed to read NMBM at offset 0x%08llx\n", off);
 +		return CMD_RET_FAILURE;
 +	}
@@ -215,7 +215,7 @@ Signed-off-by: Weijie Gao <[email protected]>
 +	switch (genimg_get_format((void *)loadaddr)) {
 +#if defined(CONFIG_LEGACY_IMAGE_FORMAT)
 +	case IMAGE_FORMAT_LEGACY:
-+		size = image_get_image_size((image_header_t *)loadaddr);
++		size = image_get_image_size((struct legacy_img_hdr *)loadaddr);
 +		image_name = "legacy";
 +		break;
 +#endif